Qt OpenGL 图像的平移（使用glTranslatef）

注意：

如果使用glVertex3f把顶点的坐标进行平移的话是一种非主流的方法；

一般使用glTranslatef进行操作，通过改变当前矩阵的坐标系来实现平移！

程序运行截图如下：

上下平移：

左右平移：

前后平移：

源码如下：

myglwidget.h

#ifndef MYGLWIDGET_H
#define MYGLWIDGET_H

#include <QOpenGLWidget>

class MyGLWidget:public QOpenGLWidget
{
    Q_OBJECT
public:
    MyGLWidget(QWidget *parent = 0);
    ~MyGLWidget();

    void XCooridinateAdd();
    void XCooridinateSub();

    void YCooridinateAdd();
    void YCooridinateSub();

    void ZCooridinateAdd();
    void ZCooridinateSub();

protected:
    void initializeGL() Q_DECL_OVERRIDE;
    void paintGL() Q_DECL_OVERRIDE;
    void resizeGL(int w, int h) Q_DECL_OVERRIDE;

private:
    float m_x;
    float m_y;
    float m_z;
};

#endif // MYGLWIDGET_H

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private slots:
    void on_leftPushButton_clicked();

    void on_rightPushButton_clicked();

    void on_upPushButton_clicked();

    void on_downPushButton_clicked();

    void on_frontPushButton_clicked();

    void on_backPushButton_clicked();

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

main.cpp

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

myglwidget.cpp

#include "myglwidget.h"
#include <GL/gl.h>
#include <GL/glu.h>


MyGLWidget::MyGLWidget(QWidget *parent):
    QOpenGLWidget(parent)
{
    m_x=0.0;
    m_y=0.0;
    m_z=0.0;
}

MyGLWidget::~MyGLWidget()
{

}

void MyGLWidget::XCooridinateAdd()
{
    m_x+=0.1;
}

void MyGLWidget::XCooridinateSub()
{
    m_x-=0.1;
}

void MyGLWidget::YCooridinateAdd()
{
    m_y+=0.1;
}

void MyGLWidget::YCooridinateSub()
{
    m_y-=0.1;
}

void MyGLWidget::ZCooridinateAdd()
{
    m_z+=0.1;
}

void MyGLWidget::ZCooridinateSub()
{
    m_z-=0.1;
}

void MyGLWidget::initializeGL()
{
    glMatrixMode(GL_PROJECTION);
    gluPerspective(50.0f,800.0f/600.0f,0.1f,1000.0f);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

void MyGLWidget::paintGL()
{
    glClearColor(30.0f /255.0f, 30.0f / 255.0f, 30.0f / 255.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    glLoadIdentity();
    glTranslatef(m_x, m_y, m_z);
    glBegin(GL_TRIANGLES);
    glColor4ub(255, 0, 0, 255); glVertex3f(-0.5f, -0.25f, -1.0f);
    glColor4ub(0, 0, 255, 255); glVertex3f(0.5f, -0.25f, -1.0f);
    glColor4ub(0, 255, 0, 255); glVertex3f(0.0f, 0.5f, -1.0f);
    glEnd();
}

void MyGLWidget::resizeGL(int w, int h)
{
    Q_UNUSED(w)
    Q_UNUSED(h)
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setWindowTitle("CSDN IT1995");
}

Widget::~Widget()
{
    delete ui;
}

void Widget::on_leftPushButton_clicked()
{
    ui->openGLWidget->XCooridinateSub();
    ui->openGLWidget->update();
}

void Widget::on_rightPushButton_clicked()
{
    ui->openGLWidget->XCooridinateAdd();
    ui->openGLWidget->update();
}

void Widget::on_upPushButton_clicked()
{
    ui->openGLWidget->YCooridinateAdd();
    ui->openGLWidget->update();
}

void Widget::on_downPushButton_clicked()
{
    ui->openGLWidget->YCooridinateSub();
    ui->openGLWidget->update();
}

void Widget::on_frontPushButton_clicked()
{
    ui->openGLWidget->ZCooridinateAdd();
    ui->openGLWidget->update();
}

void Widget::on_backPushButton_clicked()
{
    ui->openGLWidget->ZCooridinateSub();
    ui->openGLWidget->update();
}